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          <h1 class="post-title" itemprop="name headline">LinkedList源码浅析</h1>
        

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        <p>探究JDK8中ArrayList源码<br><a id="more"></a></p>
<h2 id="单向链表吗？"><a href="#单向链表吗？" class="headerlink" title="单向链表吗？"></a>单向链表吗？</h2><p>首先看内部<code>Node</code>如何定义：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">private</span> <span class="keyword">static</span> <span class="class"><span class="keyword">class</span> <span class="title">Node</span>&lt;<span class="title">E</span>&gt; </span>&#123;</span><br><span class="line">    E item; <span class="comment">// 存储实际的元素</span></span><br><span class="line">    Node&lt;E&gt; next; <span class="comment">// 引用下一个Node节点</span></span><br><span class="line">    Node&lt;E&gt; prev; <span class="comment">// 引用前一个Node节点</span></span><br><span class="line"></span><br><span class="line">    Node(Node&lt;E&gt; prev, E element, Node&lt;E&gt; next) &#123;</span><br><span class="line">        <span class="keyword">this</span>.item = element;</span><br><span class="line">        <span class="keyword">this</span>.next = next;</span><br><span class="line">        <span class="keyword">this</span>.prev = prev;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>我想，你应该懂了。。</p>
<p>需要知道的是，内部有引用首尾<code>Node</code>的属性：<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment">    * Pointer to first node.</span></span><br><span class="line"><span class="comment">    * Invariant: (first == null &amp;&amp; last == null) ||</span></span><br><span class="line"><span class="comment">    *            (first.prev == null &amp;&amp; first.item != null)</span></span><br><span class="line"><span class="comment">    */</span></span><br><span class="line"><span class="keyword">transient</span> Node&lt;E&gt; first;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment">    * Pointer to last node.</span></span><br><span class="line"><span class="comment">    * Invariant: (first == null &amp;&amp; last == null) ||</span></span><br><span class="line"><span class="comment">    *            (last.next == null &amp;&amp; last.item != null)</span></span><br><span class="line"><span class="comment">    */</span></span><br><span class="line"><span class="keyword">transient</span> Node&lt;E&gt; last;</span><br></pre></td></tr></table></figure></p>
<h2 id="添加元素"><a href="#添加元素" class="headerlink" title="添加元素"></a>添加元素</h2><p>首先回顾下数据结构的双向链表：</p>
<p><img src="https://raw.githubusercontent.com/xuanbo/blog/master/source/images/LinkedList源码浅析/1.PNG" alt="双向链表插入"></p>
<p>至于<code>LinkedList</code>如何插入，就不贴源码了。</p>
<h2 id="删除元素"><a href="#删除元素" class="headerlink" title="删除元素"></a>删除元素</h2><p>再次回顾下数据结构的双向链表：</p>
<p><img src="https://raw.githubusercontent.com/xuanbo/blog/master/source/images/LinkedList源码浅析/2.PNG" alt="双向链表删除"></p>
<p>至于<code>LinkedList</code>如何删除，也不贴源码了。。</p>
<h2 id="什么，LinkedList还实现了Deque？"><a href="#什么，LinkedList还实现了Deque？" class="headerlink" title="什么，LinkedList还实现了Deque？"></a>什么，LinkedList还实现了Deque？</h2><p>没错，有这种操作！毕竟双向链表，可以双向FIFO，没毛病。</p>

      
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